Every kid is different, so maybe you’ll get lucky by that age. Definitely invest the time to do sleep training, which should be around the corner for you guys. We’ve been dealing with night terrors lately, so a lot of sudden wake ups in the middle of the night and confusion/freaking out. Takes a bit longer to get her back down after that type of episode.
So I’m still using Windows on my desktop, but from my experience with Proton on Steam Deck, Proton works pretty flawlessly essentially translating the windows exe. I’m assuming it’s the same for a Linux desktop setup but I’ll let others who actually have experience here comment further. The only thing that you may have issues with are competitive online games, but those aren’t really my jam but understandable if they are for you.